Buy some APEX ARC-8 18 x 10 wheels that go straight on without spacers or centering rings. You can mount 275/35s on these and rotate wheels, or stick 275s on the front and 295's on the back. Your 8/9 aren't going to cut it (especially with the SC - you are never going to have enough grip for the torque) - they are designed for a different purpose - so you are going to end up buying new rims anyway!